ability to change matching delimiter pairs

Currently, changing delimiter pairs such as {} to [] or " " is cumbersome, especially when the delimiters are nested or span more than a screen full of text. This makes context tracking unnecessarily difficult and error-prone.

It would be beneficial to extend the symbol search-and-replace feature (F2) to support replacement of matching delimiter pairs, enabling the following workflow:

1. Select a delimiter
2. Press F2 to allow entry of a delimiter symbol
3. Press ENTER to apply the change, automatically updating the corresponding matching delimiter

Extending the symbol search and replace feature would be an intuitive extension of that context support functionality.

Start by tracing rust-analyzer's symbol search-and-replace feature and its F2 entry point. Review how delimiter symbols and matching pairs are currently handled, then verify that replacing a selected delimiter updates its corresponding nested or distant match when ENTER is pressed.